Is Frontier the cheapest airline to fly with from Seattle to San Diego?

With an average price of $209 return, Frontier is not the cheapest airline to fly from Seattle to San Diego with. Instead, for the lowest price, our data suggests flying with Spirit Airlines, where a return flight costs $156 on average.

What is the cheapest Frontier flight from Seattle to San Diego?

In the last 3 days, the lowest price for a flight with Frontier from Seattle to San Diego was $117 for a return flight and $69 for a one-way flight.

Does Frontier fly direct to San Diego from Seattle?

No, Frontier does not fly the route directly.

What’s the cheapest day of the week to fly from Seattle to San Diego with Frontier?

On average, the cheapest day of the week to fly from Seattle to San Diego with Frontier is Friday, when prices are around $53. The most expensive day is generally Thursday, where the average price is around $80.

What’s the cheapest month to fly from Seattle to San Diego with Frontier?

The cheapest month for Frontier flights to San Diego from Seattle is generally October, where plane tickets cost $97 on average. If possible, try to avoid the most expensive months of November and August, where tickets cost $161 and $170 respectively.

$87 Cheap Frontier Flights from Seattle to San Diego

Flight Deals

Cheap Frontier Flight Deals from Seattle to San Diego

Here are some of the best deals found on KAYAK recently from Frontier for round-trip flights from Seattle to San Diego that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip Frontier flight deals from Seattle to San Diego

Tue, Jan 6 - Wed, Jan 14

1:00 pm - 11:16 pm

SEA

SAN

10h 16m1 stop

1:35 pm - 4:28 pm

SAN

SEA

26h 53m1 stop

$120Frontier

Mon, Jan 5 - Sat, Jan 17

7:48 pm - 12:08 pm

SEA

SAN

16h 20m1 stop

12:00 pm - 11:09 am

SAN

SEA

23h 09m1 stop

$122Frontier

Thu, Feb 5 - Sun, Feb 8

9:25 pm - 9:26 am

SEA

SAN

12h 01m1 stop

8:16 pm - 11:19 am

SAN

SEA

15h 03m1 stop

$128Frontier

Thu, Feb 5 - Mon, Feb 9

12:34 pm - 12:08 am

SEA

SAN

11h 34m1 stop

2:52 pm - 10:54 am

SAN

SEA

20h 02m1 stop

$129Frontier

Fri, Feb 27 - Sat, Mar 7

12:00 pm - 7:35 pm

SEA

SAN

7h 35m1 stop

9:28 pm - 10:19 am

SAN

SEA

12h 51m1 stop

$130Frontier

Sun, Jan 25 - Sun, Feb 1

12:34 pm - 7:21 pm

SEA

SAN

6h 47m1 stop

8:16 pm - 11:19 am

SAN

SEA

15h 03m1 stop

$131Frontier

Tue, Jan 6 - Fri, Jan 9

1:00 pm - 11:16 pm

SEA

SAN

10h 16m1 stop

4:47 pm - 1:34 pm

SAN

SEA

20h 47m1 stop

$132Frontier

Fri, Jan 9 - Fri, Jan 16

12:26 pm - 7:37 pm

SEA

SAN

7h 11m1 stop

4:56 pm - 2:43 pm

SAN

SEA

21h 47m1 stop

$133Frontier

Fri, Jan 2 - Wed, Jan 14

7:48 pm - 8:47 am

SEA

SAN

12h 59m1 stop

12:00 pm - 11:09 am

SAN

SEA

23h 09m1 stop

$135Frontier

Fri, Jan 2 - Thu, Jan 15

7:48 pm - 8:47 am

SEA

SAN

12h 59m1 stop

9:12 pm - 4:28 pm

SAN

SEA

19h 16m1 stop

$136Frontier

Useful Info

Low season	July
High season	April
Cheapest flight	$87
Average price round-trip	$223

Best time to beat the crowds but there is an average 50% increase in price.

Most popular time to fly with an average 5% increase in price.

Flight from Seattle to San Diego

(price for this month)

When to Book Flights with Frontier from Seattle to San Diego

Average price per month

Flight prices as travel date approaches

Is Frontier the cheapest airline to fly with from Seattle to San Diego?
With an average price of $209 return, Frontier is not the cheapest airline to fly from Seattle to San Diego with. Instead, for the lowest price, our data suggests flying with Spirit Airlines, where a return flight costs $156 on average.
What is the cheapest Frontier flight from Seattle to San Diego?
In the last 3 days, the lowest price for a flight with Frontier from Seattle to San Diego was $117 for a return flight and $69 for a one-way flight.
Does Frontier fly direct to San Diego from Seattle?
No, Frontier does not fly the route directly.
What’s the cheapest day of the week to fly from Seattle to San Diego with Frontier?
On average, the cheapest day of the week to fly from Seattle to San Diego with Frontier is Friday, when prices are around $53. The most expensive day is generally Thursday, where the average price is around $80.
What’s the cheapest month to fly from Seattle to San Diego with Frontier?
The cheapest month for Frontier flights to San Diego from Seattle is generally October, where plane tickets cost $97 on average. If possible, try to avoid the most expensive months of November and August, where tickets cost $161 and $170 respectively.

5.8

Fair3,084 verified ratings

6.0Boarding

5.5Comfort

6.7Crew

4.4Entertainment

4.6Food

Pros +

Crew was extremely pleasant. (in 1649 reviews)

Cons -

Several individuals used foul language 50% of of the 4hr flight. (in 4167 reviews)
On the ticket it said checked bag. (in 1044 reviews)

Show reviews that mention

2.0 Poor

Verified traveler, Dec 2025

DEN

PHL

Not clean and was told I would get a great seat and it was not great at all

8.0 Very good

Yordanos, Dec 2025

SJU

PHL

Good- no snacks on a 4+ hour flight is painful but more painful was the lack of WiFi.

2.0 Poor

omnia, Dec 2025

MCO

CLE

Flight got delayed for 5 hours no good explanation was offered ;(

6.0 Okay

Verified traveler, Dec 2025

PHX

SEA

Horrible. I would never fly Frontier again. The booking process is tricky at best, but fraudulent in my opinion. Frontier customer service did nothing to rectify my purchase -- I ended up paying more than double what I could have gotten from other airlines and nearly triple what I thought I was buying from Frontier. Their booking practices are unfair to the consumer.

2.0 Poor

Daniel, Nov 2025

DEN

ATL

Delayed. Text notifications were slow. Not much information o what was happening. Boarding was slow and confusing. Wasn’t even offered water other flight. Had to ask. No entertainment at all. Felt like.a Greyhound bus.

8.0 Very good

Jaime, Nov 2025

LAS

SLC

It was excellent everything

4.0 Mediocre

Verified traveler, Nov 2025

LAX

IAH

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

8.0 Very good

Lisa, Nov 2025

PHL

SRQ

Delayed on tarmac and boarding

8.0 Very good

Martha, Nov 2025

MDW

MCO

Better than expected. Staff were friendly and nice on both flights.

2.0 Poor

Justin, Nov 2025

DEN

AUS

Worst experience ever...never fly Frontier again.

Everything you need to know for your flight from Seattle to San Diego

Airlines

Cabin class

Complete your trip

Flights to other cities

Frontier flights

Return flight deals

Other airlines flying from Seattle to San Diego

Delta flights from Seattle to San Diego

Alaska Airlines flights from Seattle to San Diego

SEA - SAN

$87 Find Cheap Frontier Flights from Seattle to San Diego

Search hundreds of travel sites at once for deals on Frontier flights from Seattle to San Diego

Cheap Frontier Flight Deals from Seattle to San Diego

Recent round-trip Frontier flight deals from Seattle to San Diego

Recent one-way Frontier flight deals from Seattle to San Diego

Recent last minute Frontier flight deals from Seattle to San Diego

Good to know

When to Book Flights with Frontier from Seattle to San Diego

FAQs for flying to San Diego with Frontier

Is Frontier the cheapest airline to fly with from Seattle to San Diego?

With an average price of $209 return, Frontier is not the cheapest airline to fly from Seattle to San Diego with. Instead, for the lowest price, our data suggests flying with Spirit Airlines, where a return flight costs $156 on average.

What is the cheapest Frontier flight from Seattle to San Diego?

In the last 3 days, the lowest price for a flight with Frontier from Seattle to San Diego was $117 for a return flight and $69 for a one-way flight.

Does Frontier fly direct to San Diego from Seattle?

No, Frontier does not fly the route directly.

What’s the cheapest day of the week to fly from Seattle to San Diego with Frontier?

On average, the cheapest day of the week to fly from Seattle to San Diego with Frontier is Friday, when prices are around $53. The most expensive day is generally Thursday, where the average price is around $80.

What’s the cheapest month to fly from Seattle to San Diego with Frontier?

The cheapest month for Frontier flights to San Diego from Seattle is generally October, where plane tickets cost $97 on average. If possible, try to avoid the most expensive months of November and August, where tickets cost $161 and $170 respectively.

Frontier Customer Reviews

Pros +

Cons -

Traveler rating:

Sort by:

Everything you need to know for your flight from Seattle to San Diego

Other airlines flying from Seattle to San Diego

Flight deals from the most popular airlines with KAYAK users flying the route

Cabin class types available on flights to San Diego

Cabin classes available on flights to Seattle. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

Complete your trip to San Diego with a hotel stay or car rental

Flights to other popular destinations

The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

Top Frontier flights

The most popular destinations for flights with Frontier according to clicks from KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

Find deals for your return flight